* Zählt die Wörter pro Benutzer.
* Simple Implementierung mit Maps.
* Verwendet die bereits für das Speichern der Nachrichten-Zählung und
der Offsets verwendete MonogoDB-Anbindung zum speichern.
* Typisierung zurückgenommn: Immer String für Key/Value
* Verwendet aus Bequemlichkeit den Seen-Endpoint von der Zählung.
command: sleep infinity
producer:
- image: juplo/endless-producer:1.0-SNAPSHOT
+ image: juplo/rest-producer:1.0-SNAPSHOT
ports:
- 8080:8080
environment:
producer.bootstrap-server: kafka:9092
producer.client-id: producer
producer.topic: test
- producer.throttle-ms: 500
-
peter:
- image: juplo/endless-consumer:1.0-SNAPSHOT
+ image: juplo/wordcount:1.0-SNAPSHOT
ports:
- 8081:8080
environment:
spring.data.mongodb.database: juplo
beate:
- image: juplo/endless-consumer:1.0-SNAPSHOT
+ image: juplo/wordcount:1.0-SNAPSHOT
ports:
- 8082:8080
environment:
</parent>
<groupId>de.juplo.kafka</groupId>
- <artifactId>endless-consumer</artifactId>
+ <artifactId>wordcount</artifactId>
<version>1.0-SNAPSHOT</version>
- <name>Endless Consumer: a Simple Consumer-Group that reads and prints the topic and counts the received messages for each key by topic</name>
+ <name>Wordcount</name>
+ <description>Splits the incomming sentences into words and counts the words per user.</description>
<dependencies>
<dependency>
public class ApplicationConfiguration
{
@Bean
- public Consumer<ConsumerRecord<String, String>> consumer()
- {
- return (record) ->
- {
- // Handle record
- };
- }
-
- @Bean
- public EndlessConsumer<String, String> endlessConsumer(
+ public EndlessConsumer endlessConsumer(
KafkaConsumer<String, String> kafkaConsumer,
ExecutorService executor,
- Consumer<ConsumerRecord<String, String>> handler,
PartitionStatisticsRepository repository,
ApplicationProperties properties)
{
return
- new EndlessConsumer<>(
+ new EndlessConsumer(
executor,
repository,
properties.getClientId(),
properties.getTopic(),
Clock.systemDefaultZone(),
properties.getCommitInterval(),
- kafkaConsumer,
- handler);
+ kafkaConsumer);
}
@Bean
@RequiredArgsConstructor
public class ApplicationHealthIndicator implements HealthIndicator
{
- private final EndlessConsumer<String, String> consumer;
+ private final EndlessConsumer consumer;
@Override
import lombok.RequiredArgsConstructor;
import org.springframework.http.HttpStatus;
-import org.springframework.web.bind.annotation.ExceptionHandler;
-import org.springframework.web.bind.annotation.GetMapping;
-import org.springframework.web.bind.annotation.PostMapping;
-import org.springframework.web.bind.annotation.ResponseStatus;
-import org.springframework.web.bind.annotation.RestController;
+import org.springframework.http.ResponseEntity;
+import org.springframework.web.bind.annotation.*;
import java.util.Map;
import java.util.concurrent.ExecutionException;
@GetMapping("seen")
- public Map<Integer, Map<String, Long>> seen()
+ public Map<Integer, Map<String, Map<String, Long>>> seen()
{
return consumer.getSeen();
}
+ @GetMapping("seen/{user}")
+ public ResponseEntity<Map<String, Long>> seen(@PathVariable String user)
+ {
+ for (Map<String, Map<String, Long>> users : consumer.getSeen().values())
+ {
+ Map<String, Long> words = users.get(user);
+ if (words != null)
+ return ResponseEntity.ok(words);
+ }
+
+ return ResponseEntity.notFound().build();
+ }
+
@ExceptionHandler
@ResponseStatus(HttpStatus.BAD_REQUEST)
import java.util.concurrent.locks.Condition;
import java.util.concurrent.locks.Lock;
import java.util.concurrent.locks.ReentrantLock;
+import java.util.regex.Pattern;
@Slf4j
@RequiredArgsConstructor
-public class EndlessConsumer<K, V> implements ConsumerRebalanceListener, Runnable
+public class EndlessConsumer implements ConsumerRebalanceListener, Runnable
{
+ final static Pattern PATTERN = Pattern.compile("\\W+");
+
+
private final ExecutorService executor;
private final PartitionStatisticsRepository repository;
private final String id;
private final String topic;
private final Clock clock;
private final Duration commitInterval;
- private final Consumer<K, V> consumer;
- private final java.util.function.Consumer<ConsumerRecord<K, V>> handler;
+ private final Consumer<String, String> consumer;
private final Lock lock = new ReentrantLock();
private final Condition condition = lock.newCondition();
private Exception exception;
private long consumed = 0;
- private final Map<Integer, Map<String, Long>> seen = new HashMap<>();
+ private final Map<Integer, Map<String, Map<String, Long>>> seen = new HashMap<>();
@Override
id,
partition,
newOffset);
- Map<String, Long> removed = seen.remove(partition);
- for (String key : removed.keySet())
- {
- log.info(
- "{} - Seen {} messages for partition={}|key={}",
- id,
- removed.get(key),
- partition,
- key);
- }
+ Map<String, Map<String, Long>> removed = seen.remove(partition);
repository.save(new StatisticsDocument(partition, removed, consumer.position(tp)));
});
}
while (true)
{
- ConsumerRecords<K, V> records =
+ ConsumerRecords<String, String> records =
consumer.poll(Duration.ofSeconds(1));
// Do something with the data...
log.info("{} - Received {} messages", id, records.count());
- for (ConsumerRecord<K, V> record : records)
+ for (ConsumerRecord<String, String> record : records)
{
log.info(
"{} - {}: {}/{} - {}={}",
record.value()
);
- handler.accept(record);
-
consumed++;
Integer partition = record.partition();
- String key = record.key() == null ? "NULL" : record.key().toString();
- Map<String, Long> byKey = seen.get(partition);
-
- if (!byKey.containsKey(key))
- byKey.put(key, 0l);
-
- long seenByKey = byKey.get(key);
- seenByKey++;
- byKey.put(key, seenByKey);
+ String user = record.key();
+ Map<String, Map<String, Long>> users = seen.get(partition);
+
+ Map<String, Long> words = users.get(user);
+ if (words == null)
+ {
+ words = new HashMap<>();
+ users.put(user, words);
+ }
+
+ for (String word : PATTERN.split(record.value()))
+ {
+ Long num = words.get(word);
+ if (num == null)
+ {
+ num = 1l;
+ }
+ else
+ {
+ num++;
+ }
+ words.put(word, num);
+ }
}
if (lastCommit.plus(commitInterval).isBefore(clock.instant()))
}
}
- public Map<Integer, Map<String, Long>> getSeen()
+ public Map<Integer, Map<String, Map<String, Long>>> getSeen()
{
return seen;
}
@Id
public String id;
public long offset = -1l;
- public Map<String, Long> statistics;
+ public Map<String, Map<String, Long>> statistics;
public StatisticsDocument()
{
this.statistics = new HashMap<>();
}
- public StatisticsDocument(Integer partition, Map<String, Long> statistics, long offset)
+ public StatisticsDocument(Integer partition, Map<String, Map<String, Long>> statistics, long offset)
{
this.id = Integer.toString(partition);
this.statistics = statistics;
PartitionStatisticsRepository repository;
Consumer<ConsumerRecord<String, String>> testHandler;
- EndlessConsumer<String, String> endlessConsumer;
+ EndlessConsumer endlessConsumer;
Map<TopicPartition, Long> oldOffsets;
Map<TopicPartition, Long> newOffsets;
Set<ConsumerRecord<String, String>> receivedRecords;
};
endlessConsumer =
- new EndlessConsumer<>(
+ new EndlessConsumer(
executor,
repository,
properties.getClientId(),
properties.getTopic(),
Clock.systemDefaultZone(),
properties.getCommitInterval(),
- kafkaConsumer,
- captureOffsetAndExecuteTestHandler);
+ kafkaConsumer);
endlessConsumer.start();
}
projects / demos / kafka / training / commitdiff